not to feel something, as though one is dreaming it (see Molina, who gives this example in the first person singular, ni-)
Alonso de Molina:
ayatemico nitlachia. no se sentir la cosa, siquiera como el que sueña algo. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 3r. col. 2. Thanks to Joe Campbell for providing the transcription.